fix: resolve TypeScript and ESLint errors across the codebase

- Fixed @typescript-eslint/no-unused-vars errors (31 instances)
- Fixed @typescript-eslint/no-explicit-any errors in backend (~22 instances)
- Fixed @typescript-eslint/no-explicit-any errors in frontend (~60 instances)
- Fixed prefer-const errors (5 instances)
- Fixed no-empty-object-type and rules-of-hooks errors
- Added proper type assertions for database operations
- Improved type safety in authentication and encryption modules
- Enhanced type definitions for API routes and SSH operations

All TypeScript compilation errors resolved. Application builds and runs successfully.

src/backend/utils/user-data-import.ts

@@ -89,7 +89,7 @@ class UserDataImport {
       ) {
         const importStats = await this.importSshHosts(
           targetUserId,
-          exportData.userData.sshHosts,
+          exportData.userData.sshHosts as Record<string, unknown>[],
           { replaceExisting, dryRun, userDataKey },
         );
         result.summary.sshHostsImported = importStats.imported;
@@ -104,7 +104,7 @@ class UserDataImport {
       ) {
         const importStats = await this.importSshCredentials(
           targetUserId,
-          exportData.userData.sshCredentials,
+          exportData.userData.sshCredentials as Record<string, unknown>[],
           { replaceExisting, dryRun, userDataKey },
         );
         result.summary.sshCredentialsImported = importStats.imported;
@@ -129,7 +129,7 @@ class UserDataImport {
       ) {
         const importStats = await this.importDismissedAlerts(
           targetUserId,
-          exportData.userData.dismissedAlerts,
+          exportData.userData.dismissedAlerts as Record<string, unknown>[],
           { replaceExisting, dryRun },
         );
         result.summary.dismissedAlertsImported = importStats.imported;
@@ -159,7 +159,7 @@ class UserDataImport {
 
   private static async importSshHosts(
     targetUserId: string,
-    sshHosts: any[],
+    sshHosts: Record<string, unknown>[],
     options: {
       replaceExisting: boolean;
       dryRun: boolean;
@@ -198,7 +198,9 @@ class UserDataImport {
 
         delete processedHostData.id;
 
-        await getDb().insert(sshData).values(processedHostData);
+        await getDb()
+          .insert(sshData)
+          .values(processedHostData as unknown as typeof sshData.$inferInsert);
         imported++;
       } catch (error) {
         errors.push(
@@ -213,7 +215,7 @@ class UserDataImport {
 
   private static async importSshCredentials(
     targetUserId: string,
-    credentials: any[],
+    credentials: Record<string, unknown>[],
     options: {
       replaceExisting: boolean;
       dryRun: boolean;
@@ -254,7 +256,11 @@ class UserDataImport {
 
         delete processedCredentialData.id;
 
-        await getDb().insert(sshCredentials).values(processedCredentialData);
+        await getDb()
+          .insert(sshCredentials)
+          .values(
+            processedCredentialData as unknown as typeof sshCredentials.$inferInsert,
+          );
         imported++;
       } catch (error) {
         errors.push(
@@ -269,7 +275,7 @@ class UserDataImport {
 
   private static async importFileManagerData(
     targetUserId: string,
-    fileManagerData: any,
+    fileManagerData: Record<string, unknown>,
     options: { replaceExisting: boolean; dryRun: boolean },
   ) {
     let imported = 0;
@@ -356,7 +362,7 @@ class UserDataImport {
 
   private static async importDismissedAlerts(
     targetUserId: string,
-    alerts: any[],
+    alerts: Record<string, unknown>[],
     options: { replaceExisting: boolean; dryRun: boolean },
   ) {
     let imported = 0;
@@ -376,7 +382,7 @@ class UserDataImport {
           .where(
             and(
               eq(dismissedAlerts.userId, targetUserId),
-              eq(dismissedAlerts.alertId, alert.alertId),
+              eq(dismissedAlerts.alertId, alert.alertId as string),
             ),
           );
 
@@ -395,10 +401,12 @@ class UserDataImport {
         if (existing.length > 0 && options.replaceExisting) {
           await getDb()
             .update(dismissedAlerts)
-            .set(newAlert)
+            .set(newAlert as typeof dismissedAlerts.$inferInsert)
             .where(eq(dismissedAlerts.id, existing[0].id));
         } else {
-          await getDb().insert(dismissedAlerts).values(newAlert);
+          await getDb()
+            .insert(dismissedAlerts)
+            .values(newAlert as typeof dismissedAlerts.$inferInsert);
         }
 
         imported++;